A portion of the shoreline and river adjacent to Reynolds Aluminum (now
Alcoa) was contaminated with high levels of PCBs and PAHs. Faust Corporation
was contracted as the Prime Dredging Contractor as part of the sediment
remediation project. To prevent possible downstream transportation of
re-suspended sediment the entire dredge area was enclosed within a steel
sheet pile wall.The dredge area was
divided into areas of high and low PCB concentrations. The high
concentration areas were enclosed with silt curtains and air curtain gates
were installed to allow for the movement of marine equipment.Sediments were removed from the river using an environmental level
cut clamshell bucket, placed into sediment scows and transported to the
unloading dock. At this point the material was loaded into trucks and hauled
to the dewatering/stabilization area before transport to the disposal
facility

UNIQUE
SOLUTIONS:

To minimize the amount of water reaching the dock a filter pen system was
developed that allowed water to drain from the sediments within the sediment
scow and drain through a filter system back into the dredge area. This
significantly reduces the amount of Portland required to stabilize the material
for shipment.